It's the norm now, really since the National System of Interstate and Defense Highways was built and its effects kicked in. The highways made it really easy to move out of town and get estate-sized properties. So the middle class moved out and the poor, who couldn't afford the estates or the travel costs, stayed in the cities.

Look at a map of Philly and you'll see the effect pretty clearly. Like in all cities, there's a small area right in town of very high incomes, but otherwise, it's poverty. I think too that there's been a countermove, you know--gentrification--in the last decade or two, but that happens only in "desirable" cities, big cities. In places like where I live, small cities with populations up to 200,000 or so, the inner city is an economic wasteland.

Here though the inner city is very small (China Town) where it is sorta ghetto looking maybe about 4 blocks big. Go down a block or 2 where the tall buildings are , the apartment rents start at 3,000 and up.

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